Enabled

3.0 A ILIMIT

Disabled

Enabled

Disabled

EN1_EN0

PP5V to VBUS (SRC)

VBUS to PPHV (SNK)

Disabled

00b

01b

00b

11b

00b

Disabled

01b

Enabled

t

OFF_PPHV

t

ON_PP5V

t

ON_PPHV

t

OFF_PP5V

t

DG_EN

t

DG_EN

t

DG_EN

Enabled

1.5A ILIMIT

Disabled

Enabled

Disabled

EN1_EN0

PP5V to VBUS (SRC)

VBUS to PPHV (SNK)

Disabled

00b

01b

00b

10b

00b

Disabled

01b

Enabled

t

OFF_PPHV

t

ON_PP5V

t

ON_PPHV

t

OFF_PP5V

t

DG_EN

t

DG_EN

t

DG_EN

23

TPS66020, TPS66021

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SLVSEW8 – AUGUST 2019

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Device Functional Modes (continued)

Table 2. TPS6602x Device Functional Modes() (continued)

EN1

EN0

VIN

FLT

Device State

Source Path

Sink Path

(3)

In this case VLDO is supplying power to the device.

0

1

< UV_VIN

≥

X

Hi-Z

SNK

Disabled

Safety engaged.

Enabled

RCP, OVT enabled

X

Hi-Z

SNK FAULT

Disabled

Safety engaged.

Enabled with Blocking

RCP event.

X

L

SNK FAULT

Disabled

Safety engaged.

Disabled

<

X

Hi-Z

SNK FAULT

Disabled

Safety engaged.

Disabled

VBUS UVLO event.

8.7.5 Enabling the PP5V Source Path

The timing diagram of enabling the PP5V Source path with a current limit set to 1.5 A is shown in Figure 11. As

shown, transitions from either the Source path to the Sink path or vice-versa always requires a transition first to

the DISABLED state, EN1_EN0 = 00b. Figure 12 shows the timing diagram going from a Sink to a 3-A Source.

Figure 13 shows changing the current limit back to 1.5 A from its original 3-A setting.

Figure 11. Enabling the PP5V Source Path to 1.5-A Current Limit

Figure 12. Enabling the PP5V Source Path to 3-A Current Limit